tc_get.c

Go to the documentation of this file.

/*
** Copyright (C) 2004, 2005 by Kevin L. Mitchell <klmitch@mit.edu>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** @(#)$Id: tc_get.c,v 1.4 2005/06/07 04:53:50 klmitch Exp $
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "treeconf_int.h"

RCSTAG("@(#)$Id: tc_get.c,v 1.4 2005/06/07 04:53:50 klmitch Exp $");

unsigned int
tc_get(treeconf_ctx_t *ctx, const char *name, const char **value,
       treeconf_node_t *parent)
{
  struct result res;
  unsigned int err = 0;

  initialize_trcf_error_table();

  /* Verify the arguments */
  if (!tx_verify(ctx) || !name ||
      (parent && (!tn_verify(parent) || parent->tn_context != ctx)))
    return EINVAL;

  /* OK, look up the node... */
  if ((err = _tc_lookup_node(ctx, name, parent, &res)))
    return err;

  /* Couldn't find the requested node? */
  if (!res.r_node || res.r_count != res.r_startnew)
    err = ENOENT;
  else if ((res.r_node->tn_type & TC_NODETYPE_MASK) != TC_NODETYPE_VARIABLE)
    err = TC_ERR_MISMATCH; /* a tree node, not a variable node */
  else if (value)
    *value = res.r_node->tn_value; /* return the value */

  free(res.r_comps); /* Release temporarily allocated memory */

  return err;
}

---